Romain, 23, is the watchman of a small Paris hotel. He does not know it yet but he is about to become a novelist! Madeleine is six decades older than him and is his grandmother. Surprisingly enough, the age gap does not mean a thing for them and they share a special bond. One day, Madeleine escapes from the nursing home where she has been placed against her will by her sons (one of whom, Michel, is Romain’s father). Romain asks
his employer for a leave and joins her for a day full of surprises!